One morning I scrambled over the rocks around the pool to get as close as possible to where they were feeding. You could see them sculling, their huge fins sliding out of the water.
Two turtles had a bit of a disagreement over who had right of way. Needless to say the biggest beast won.
One sculled around the pool, looking for the an unoccupied patch of algae.
Another came very close, and I was able to photograph its delicately patterned shell,